?? 包含設計.cpp
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#include<iostream.h>
#include<math.h>
class point{
public:
double x;
double y;
point();
point(double a,double b);
};
point::point()
{
x=0;
y=0;
}
point::point(double a,double b)
{
x=a;
y=b;
}
class line{
private:
point M;
point N;
double length;
public:
line();
line(point A,point B);
void print();
};
line::line()
{
length=0;
}
line::line(point A,point B)
{
length=sqrt((A.x-B.x)*(A.x-B.x)+(A.y-B.y)*(A.y-B.y));
}
void line::print()
{
cout<<"線的長度"<<length<<endl;
}
void main()
{
point a;
cout<<"輸入點a的橫坐標:";
cin>>a.x;
cout<<"輸入點a的縱坐標:";
cin>>a.y;
point b;
cout<<"輸入點b的橫坐標:";
cin>>b.x;
cout<<"輸入點b的縱坐標:";
cin>>b.y;
line L(a,b);
L.print();
}
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